1963

7.1

1942

6.4

1940

6.4

1950

5.5

1933

6.4

1955

5.5

1926

5.3

1930

7.4

1943

3.9

1936

6.4

1934

5.7

1935

5.3

1951

6.5

1953

5.1

1952

5.8

1956

5.1

1954

5.8

1967

7.6

1963

7.2

1960

5.0